I use an app that waits until I'm on a WiFi connection and then syncs new photos to my Dropbox account.
Link?
Sorry, I've mentioned it a few times here already so I think I just assumed.
It's called
Dropin. It works pretty well, actually. There are a few quirks, but it's the app that finally made it completely unnecessary to connect my phone to my computer. Android has always had this reputation for being sync-free, but that doesn't mean you didn't have to connect it to the computer sometimes for certain purposes. Now I don't.